I put some dumps on the stang a couple weeks ago, and it seems now like it lost some power, just a little, but it seems like it. Anybody else experience this after switching to turndowns? Also, did you have problems with the turndown pipes knocking against the axle? Mine stuck out a little so I trimmed them down, but I'm getting this ungodly sounding knock anytime I go over a bump now, I think they're knocking.